int GSM_ON    = 9;
int GSM_RESET = 10;

void setup()
{
  Serial.begin(115200);
  Serial3.begin(9600);
  
  pinMode(GSM_ON, OUTPUT);
  digitalWrite (GSM_ON, HIGH);
  delay(1200);
  digitalWrite (GSM_ON, LOW);
  delay(5000);
}

void loop()
{
  if (Serial3.available() > 0)
  {
    Serial.print ((char) Serial3.read());
  }
  
  if (Serial.available() > 0)
  {
    Serial3.print ((char) Serial.read());
  }  
}

